Kokoro - Guardian Angel

Kokoro's lore and traits by coincidence fit rather well with the description you gave to this.
Her and her mother were killed and her father made a deal with the devil to resurrect her (More details if requested). She likes helping people find things.

I like this version more than both the original chibi child version and the adult version Kokoro.

Added Emotions, located in a green box with a skull inside Kokoro's brain! Couldn't add emotions to the previous because of serious lag, you'd have to have no hoodie... -_-

心？kokoro?　　nice